| Gahanna to Orbetello | 4,615.98 mi (7,428.70 km) |
| Gahanna to Oria | 4,964.00 mi (7,988.78 km) |
| Gahanna to Oristano | 4,599.39 mi (7,402.01 km) |
| Gahanna to Orta Nova | 4,849.32 mi (7,804.22 km) |
| Gahanna to Orte | 4,664.72 mi (7,507.14 km) |
| Gahanna to Ortona | 4,753.34 mi (7,649.76 km) |
| Gahanna to Orvieto | 4,643.09 mi (7,472.33 km) |
| Gahanna to Orzinuovi | 4,451.38 mi (7,163.80 km) |
| Gahanna to Osimo | 4,670.42 mi (7,516.32 km) |
| Gahanna to Ospitaletto | 4,451.44 mi (7,163.90 km) |
| Gahanna to Ostuni | 4,952.10 mi (7,969.63 km) |
| Gahanna to Ottaviano | 4,817.05 mi (7,752.29 km) |
| Gahanna to Ovada | 4,425.70 mi (7,122.47 km) |
| Gahanna to Ozieri | 4,591.67 mi (7,389.57 km) |
| Gahanna to Paceco | 4,849.86 mi (7,805.10 km) |
